There are some works to get ZFS version 14 in 8-STAbBLE/9-CURRENT, maybe you will be albe to import it after upgrade to that bleeding edge.

Use zpool upgrade command to get info which zpool version you have:

freebsd 8.0 %zpool upgrade
This system is currently running ZFS pool version 13.

All pools are formatted using this version.

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I created two FreeBSD 8 VM's, attached a second virtual disk to the first VM and make did a "zpool create/zfs create" on it, after shutting down and starting the second FreeBSD 8 VM I could use the import/list commands as one would expect ...

Maybe there is some incompatibility between "OpenSolaris ZFS" and "FreeBSD ZFS"? If I have more time I'll try creating a osol VM so I can toy around with that ...

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* the O/Sol zpool version is greater than the FreeBSD zpool command supports (I believe I saw something that O/Sol was moving to ZFSv15), in which case you are SoL until a newer ZFS version is imported to FreeBSD

* the O/Sol pool uses a different GPT format that FreeBSD's gpart/glabel can't read correctly. I've read reports online where pools created in O/Sol were not importable in FreeBSD, but the inverse was possible (create pool under FreeBSD, fill with data in O/Sol, re-import into FreeBSD).